A remote attacker could send a carefully crafted packet in InduSoft Web Studio v8.1 and prior versions, and/or InTouch Machine Edition 2017 v8.1 and prior versions during a tag, alarm, or event related action such as read and write, which may allow remote code execution.
https://www.tenable.com/security/research/tra-2018-07
https://ics-cert.us-cert.gov/advisories/ICSA-18-107-01
http://www.securityfocus.com/bid/103949
http://software.schneider-electric.com/pdf/security-bulletin/lfsec00000125/